I have a kjw glock 23. I put about 5000 rounds through it with one magazine alone. no problems. It just had a plasticy feel compared to my TM4.3.
my only disappointment with this unit is that there is no trigger safety like the real glock. apparently kjw took it out for legal reasons as the trigger does have a 2 stage pull and the slot for the trigger safety.
this is what it looks like with the trigger safety in. http://www.arniesairsoft.co.uk/revie...0085-large.JPG
does anyone know if there are upgrade parts available for the 23?